Story by Mark Hume with Photography by Margaret Munro The Inuit village of Sachs Harbour lies on the southern tip of Banks Island in the central Canadian Arctic, about 500 miles East of the Alaska-Yukon border. It is way out there in the middle of nowhere and about as far from salmon country as you can get. A decade ago, however, the subsistence fishermen who set nets for Arctic char at river mouths around Sachs Harbour pulled in some interesting fish. There, thrashing in the nets with the brilliantly colored char they’d come to expect, where eight beautiful silver and green fish of a kind they’d never seen before. The fish were later identified as sockeye and pink salmon – and they were sexually mature. The Pacific salmon shouldn’t have been there, searching for a river to spawn in on the usually frozen coast of Banks Island, but they were and that catch, as it turns out, is a far from isolated event in the rapidly changing Arctic. All across the far north there have been incidental catches of salmon like that enough to suggest that salmon are starting to colonize the High Arctic. All five species of Pacific salmon have been found in the Arctic, moving in from the West along the north coast of Alaska, while Atlantics are straying in from the East around the northern tip of Quebec. Fisheries scientists who have been tracking the phenomenon say it is unclear yet whether there is a growing trend, driven by global warming, or whether there are just more reports because people are looking harder. They do note, however, that if Arctic waters warm just a few more degrees vast new habitat will open up to both Pacific and Atlantic salmon. Scientists studying...